Sun Microsystems StorEdge S1 AC100, Installation And Maintenance Manual

Page: 85 / 128

Chapter 3 Installing the StorEdge S1 Enclosure 49
7. If you are installing three or more StorEdge S1 enclosures, repeat Step 5 and
Step 6 until all enclosures are attached the SCSI chain.
See
FIGURE 3-16
through
FIGURE 3-18
in “To Determine the Available SCSI IDs” on
page 39 for some examples of cabling configurations.
8. Determine if you need to install an external terminator at the end of the SCSI
daisy-chain.
■
If the last device in the SCSI daisy-chain is a StorEdge S1 storage enclosure or
some other type of UltraSCSI device, do not install an external terminator on the
device. The on-board autoterminator in the device functions in UltraSCSI mode.
■
If the last device in the SCSI daisy-chain is a wide SCSI device, install an external
terminator on the SCSI OUT port on that device if it requires one. Refer to the
documentation that came with your wide SCSI device to determine if it needs an
external terminator.
Note –
Wide SCSI Devices use a 16- or 32-bit bus and transmit twice as much data
as a narrow SCSI device.
■
If the last device in the SCSI daisy-chain is a narrow SCSI device, install an
external terminator on the SCSI OUT port on that device.
See “Auto-termination Indication LEDs” on page 72 for a description of the
autotermination LEDs.
FIGURE 3-20
Daisy-Chaining a StorEdge S1 Storage Enclosure With a Narrow SCSI Device
Host system
StorEdge S1 enclosure
Narrow SCSI device
SCSI port
SCSI OUT port
SCSI IN port
SCSI OUT port
SCSI IN port
with terminator